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Precipitation of radiation belt electrons by lightning-generated magnetospherically reflecting whistler waves

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Precipitation of radiation belt electrons by lightning-generated magnetospherically reflecting whistler waves
作者:	Bortnik, Jacob.
面頁冊數:	199 p.
附註:	Adviser: Umran S. Inan.
附註:	Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 2004.
Contained By:	Dissertation Abstracts International65-04B.
標題:	Engineering, Electronics and Electrical.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3128351
ISBN:	0496756133

Precipitation of radiation belt electrons by lightning-generated magnetospherically reflecting whistler waves
Bortnik, Jacob.

Precipitation of radiation belt electrons by lightning-generated magnetospherically reflecting whistler waves [electronic resource] - 199 p.

Adviser: Umran S. Inan.

Thesis (Ph.D.)--Stanford University, 2004.

This dissertation presents a study of several aspects of the resonant interaction between energetic radiation-belt electrons and lightning generated, magnetospherically-reflecting (MR) whistler mode waves in the inner magnetosphere.

ISBN: 0496756133Subjects--Topical Terms:

226981
Engineering, Electronics and Electrical.

Precipitation of radiation belt electrons by lightning-generated magnetospherically reflecting whistler waves
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500 $a Source: Dissertation Abstracts International, Volume: 65-04, Section: B, page: 2004.
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520 # $a This dissertation presents a study of several aspects of the resonant interaction between energetic radiation-belt electrons and lightning generated, magnetospherically-reflecting (MR) whistler mode waves in the inner magnetosphere.
520 # $a Using the above formulation, we compute the f-t spectra of an MR whistler at 1° latitude bins along a given field line, and use a novel technique to calculate the precipitated flux of energetic electrons as a function of time, at every latitude bin on the field-line, including gyro-harmonic resonance interactions of order +5 to -5 as well as the zero order or Landau resonance. We use a realistic AE8 flux distribution for the trapped flux composing the radiation belts, with a sinusoidal pitch-angle distribution. Results indicate that MR whistler-induced precipitation episodes can last for tens of seconds and move to higher L-shells (and hence latitudes) on both short (0.1 sec) and long (10 sec) timescales, covering a geographic region measuring hundreds of kilometers.
520 # $a We conclude that lightning-generated MR whistlers produce unique temporal, spatial, and L-dependent signatures of precipitating, energetic, radiation belt electrons, which can be detected using either satellite-borne instruments or ground-based techniques.
520 # $a We initially develop a first-order model to estimate the L-shell dependence of the precipitation flux of energetic electrons driven by MR whistlers injected at 25°, 35°, and 45° geomagnetic latitude, assuming first a horizontally stratified ionosphere and then an ionosphere containing realistic horizontal density gradients. Results indicate an L-shell dependent pattern of precipitation which agrees remarkably well with observations made aboard the SAMPEX satellite.
520 # $a We then perform a detailed calculation of the frequency-time ( f-t) characteristics and power of an MR whistler generated by a single cloud-ground discharge at a given latitude, as it would appear on a satellite at any point in the magnetosphere. By developing an extensive ray tracing and interpolation technique, we simulate a whistler observed aboard the OGO 1 satellite to find excellent agreement between theory and measurement. By varying the lightning injection latitude, magnetospheric observation location, and cold-plasma distribution, we obtain f-t signatures the clearly reflect the underlying source, medium, and observation properties.
590 $a School code: 0212.
650 # 0 $a Engineering, Electronics and Electrical. $3 226981
650 # 0 $a Physics, Fluid and Plasma. $3 227264
650 # 0 $a Physics, Electricity and Magnetism. $3 227483
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710 0 # $a Stanford University. $3 212607
773 0 # $g 65-04B. $t Dissertation Abstracts International
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790 1 0 $a Inan, Umran S., $e advisor
791 $a Ph.D.
792 $a 2004
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